arch/x86/registers.cpp

41 // Offset in xsave area that components >= 2 start at.
44 // The first xsave component in the extended (non-legacy) area.
66 // they are inside the legacy xsave area. Use XSAVE_FIRST_EXT_COMPONENT for
105 static_assert(sizeof(x86_xsave_legacy_area) == 416, "Size of legacy xsave area should match spec.");
139 // Sets the portions of the xsave legacy area such that the x87 state is considered in its "initial
147     // The initial value of the FTW register is 0xffff. The FTW field in the xsave area is an
192             // want to make to the init state is having SIMD exceptions masked. The "legacy" area
194             xsave_area* area = reinterpret_cast<xsave_area*>(extended_register_init_state);
195             set_x87_initial_state(&area->legacy);
196             set_sse_initial_state(&area->legacy);
197             area->legacy.mxcsr = 0x3f << 7;
200                 area->xstate_bv |= X86_XSAVE_STATE_BIT_SSE;
205                     area->xcomp_bv |= XSAVE_XCOMP_BV_COMPACT;
206                     area->xcomp_bv |= area->xstate_bv;
577     xsave_area* area = reinterpret_cast<xsave_area*>(register_state);
581     // Components 0 and 1 are special and are always present in the legacy area.
584         if (!(area->xstate_bv & state_component_bit)) {
588                 set_x87_initial_state(&area->legacy);
590                 set_sse_initial_state(&area->legacy);
593                 area->xstate_bv |= state_component_bit;
597         return area;
600     if (!(area->xcomp_bv & XSAVE_XCOMP_BV_COMPACT)) {
610         if (!(area->xstate_bv & state_component_bit)) {
616                 area->xstate_bv |= state_component_bit;
624     if (!(area->xcomp_bv & state_component_bit)) {
635         if (!(area->xcomp_bv & (1ul << i))) {
650     if (!(area->xstate_bv & state_component_bit)) {
656             area->xstate_bv |= state_component_bit;